php文件操作之如何获取文件的时间属性「信息」

1. Introduction

PHP is a scripting language that can be used to manipulate files in various ways. One common task is to get the time properties of a file, such as the creation time, modification time, and last access time. In this tutorial, we will discuss how to get these time properties using PHP.

2. The filemtime() function

To get the modification time of a file, we can use the built-in filemtime() function. This function takes a file path as its parameter and returns the Unix timestamp of when the file was last modified.

Here's an example:

$filename = "example.txt";

$modificationTime = filemtime($filename);
echo "File modification time: " . date("F d Y H:i:s.", $modificationTime);

In this example, we first define a variable $filename that contains the name of the file we want to check. We then pass this variable as a parameter to the filemtime() function to get the modification time of the file. Finally, we use the date() function to format the Unix timestamp into a readable date and time format.

Note that the filemtime() function returns the modification time as a Unix timestamp, which is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC. We use the date() function to convert this Unix timestamp to a readable format.

3. The filectime() function

The filectime() function is similar to the filemtime() function, but it returns the creation time of a file instead of the modification time. The syntax is the same:

$filename = "example.txt";

$creationTime = filectime($filename);
echo "File creation time: " . date("F d Y H:i:s.", $creationTime);

In this example, we use the filectime() function to get the creation time of the file, and then format it using the date() function.

4. The fileatime() function

The fileatime() function returns the last access time of a file. Here's an example:

$filename = "example.txt";

$lastAccessTime = fileatime($filename);
echo "File last access time: " . date("F d Y H:i:s.", $lastAccessTime);

In this example, we use the fileatime() function to get the last access time of the file, and then format it using the date() function.

5. Conclusion

In this tutorial, we learned how to use the filemtime(), filectime(), and fileatime() functions to get the modification time, creation time, and last access time of a file, respectively. These functions are useful for various tasks, such as monitoring file changes, tracking file usage, and creating custom file management tools.